Smaller than traditional cars, they are still required to have automotive grade headlights, seatbelts, windshields, brakes and other safety equipment. With a top speed of 25 MPH, the cars can only be used on streets with a posted 35 MPH speed limit. Check out the section on “Commute Cars”. Given the price of gasoline, having a stable of different vehicles for different uses sounds more and more reasonable.
Read more here